15661427 has 8 divisors (see below), whose sum is σ = 15869952. Its totient is φ = 15454600.

The previous prime is 15661423. The next prime is 15661439. The reversal of 15661427 is 72416651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15661427 - 2² = 15661423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15661393 and 15661402.

It is not an unprimeable number, because it can be changed into a prime (15661423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31652 + ... + 32142.

It is an arithmetic number, because the mean of its divisors is an integer number (1983744).

Almost surely, 2^15661427 is an apocalyptic number.

15661427 is a deficient number, since it is larger than the sum of its proper divisors (208525).

15661427 is a wasteful number, since it uses less digits than its factorization.

15661427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849.

The product of its digits is 10080, while the sum is 32.

The square root of 15661427 is about 3957.4520843593. The cubic root of 15661427 is about 250.1941265538.

The spelling of 15661427 in words is "fifteen million, six hundred sixty-one thousand, four hundred twenty-seven".